Emailed him and he said it was a VFD truck, so potentially low miles, but probably rode hard and put up wet. But I'm not planning on fixing it up, just stealing parts...
As far as it not running, his excuse was the wiring problems throughout, because apparently any hot wire is good to run emergency lights off of...
I asked him in a second email to check about the front axle, my Haynes manual does list "Dana 60 mono-beam" under the '84 axle specs, but it is a Haynes manual...
I figured for that price, if I could get a Dana 60, a spare 6.9, and a heap of various parts, it might be worth it. I'll beabout 100 miles from him this weekend when I go to a family reunion, so if it is worth looking at, then I might drive over that way.